package com.sky.service.impl;

import com.github.pagehelper.Constant;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐，同时需要保存 套餐和菜品 的关联关系
     * @param setmealDTO
     */
    @Transactional
    public void save(SetmealDTO setmealDTO) {
        //1.1拷贝数据到setmeal里
        Setmeal setmeal=new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //1.2向套餐表插入数据
        setmealMapper.insert(setmeal);

        //2.1获取生成的套餐id
        Long setmealId =setmeal.getId();

        //2.2获取待关联的菜品
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmeal.getId());//setmealId
        });

        //3.关联菜品
        setmealDishMapper.insertBetch(setmealDishes);
    }

    /**
     * 分页查询套餐信息
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);//TODO 疑惑？这里为什么要用SetmealVO来接受
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 删除套餐
     * @param ids
     */
    public void delete(List<Long> ids) {
        //起售中的套餐不能删除
            ids.forEach(id->{
                Setmeal setmeal =setmealMapper.getById(id);
                if (StatusConstant.ENABLE==setmeal.getStatus()){
                    //起售中的套餐不能删除
                    throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
                }
            });
        ids.forEach(setmealid->{
            //删除套餐表中的数据(根据id)
            setmealMapper.deleteById(setmealid);
            //删除套餐关联表中的数据（根据setmealId）
            setmealDishMapper.deleteBySetmealId(setmealid);
        });
    }

    /**
     * 根据id查询套餐菜品关系
     * @param id
     * @return
     */
    public SetmealVO getByIdWithDish(Long id) {

        //查询套餐数据
        Setmeal setmeal = setmealMapper.getById(id);
        //查询套餐菜品数据
        List<SetmealDish>  setmealDishes=setmealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    /**
     * 修改套餐
     * @param setmealDTO
     */
    public void update(SetmealDTO setmealDTO) {
        //1.修改套餐表，执行update
        Setmeal setmeal =new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        setmealMapper.update(setmeal);

        //套餐id
        Long setmealId=setmeal.getId();

        //2、删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete

        setmealDishMapper.deleteBySetmealId(setmealId);
        //3、重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
            //重新获取id
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
            System.out.println("啊,sdasdasdsdadasdasdahaisdaifaigfiygfiegiaugfiaf164681561151________________________________________________________"+setmealId);
        });
        setmealDishMapper.insertBetch(setmealDishes);
    }

    /**
     * 起售停售套餐
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status== StatusConstant.ENABLE){
            //通过套餐id获得菜品数据集
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            //通过菜品数据集获取菜品起售状态。
            dishList.forEach(dish -> {
                if (dish.getStatus()==StatusConstant.DISABLE){
                    throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                }
            });
        }
        Setmeal setmeal=Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);//List
        return list;
    }

    /**
     * 根据套餐id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

}
